a hand or needle on a graduated instrument
an instrument for giving visual readings attached to a machine or apparatus
a flashing light or other device on a vehicle that is used to show the driver's intention to change direction
a screen at a railway station or airport showing details of arrivals and departures
a substance that shows, esp by change of colour, the condition of a solution, the presence of a particular material, or the end point of a chemical reaction
= tracer (2)
something that gives an indication, e.g. a statistic that indicates the state of a national economy
a plant or animal species that is known to prefer particular environmental conditions and therefore indicates the existence of those conditions by its presence
indicatory /inʹdikət(ə)ri/ adj